The second whore-lit craze has died down since the days following the success of the first Belle de Jour book. Most of the ones that followed weren't particularly good (especially the ones from the male escorts).
Part of the problem is that publishers think they know what the audience wants, and it's not the truth - this was a huge reason why most of the male ones were so bad, even the best of them minimised the issue of predominately male clients because the publishers didn't want a 'gay' book.
So given that you're probably going to have to publish it yourself (much easier than it used to be) why not skip the book part and do a really good blog? If it's a big success, you'll get the book deal anyway. (Tip if that happens: as with escorting, get the money first! If it's not in the advance, you'll probably never see it.) If it's not, and you want to write a real paper book, you'll have saved yourself having a room full of unsold books.